Abstract: A flexible center type friction clutch plate including a pair of identical annular guiding plates and a hub with a radially outwardly extending web intermediate thereof. Passages are provided along the periphery of both of the annular guiding plates. The passages in one of the annular guiding plates serve to mount the friction disc secured thereto by rivets. The passages in the other annular guiding plate which hitherto were left unused serve to mount friction shoes which enhance the "hysteresis" effect complementing that provided by the friction washers between the web and one of the annular guiding plates. By choosing the number of friction shoes in the passages the precise hysteresis effect may be achieved.

Abstract: The invention relates to annular diaphragms for example for use in clutches, comprising a peripheral portion forming a Belleville washer and a central portion fragmented by slots into radial segments. By means of the method according to the invention, in order to obtain a reduced width for the open end of the slots, the two edges of the slots are produced in two separate operations, namely a first cutting operation in the course of which one of these edges is first formed and then a second cutting operation in the course of which the other edge is formed.